From 923b352f19d9ea971ae2536eab55f5fc9e95fedf Mon Sep 17 00:00:00 2001 From: Arik Nemtsov Date: Wed, 8 Jul 2015 15:41:44 +0300 Subject: [PATCH] cfg80211: use RTNL locked reg_can_beacon for IR-relaxation The RTNL is required to check for IR-relaxation conditions that allow more channels to beacon. Export an RTNL locked version of reg_can_beacon and use it where possible in AP/STA interface type flows, where IR-relaxation may be applicable. Fixes: 06f207fc5418 ("cfg80211: change GO_CONCURRENT to IR_CONCURRENT for STA") Signed-off-by: Arik Nemtsov Signed-off-by: Emmanuel Grumbach Signed-off-by: Johannes Berg --- include/net/cfg80211.h | 17 ++++++++++++++++ net/mac80211/tdls.c | 6 +++--- net/wireless/chan.c | 45 +++++++++++++++++++++++++++++++----------- net/wireless/nl80211.c | 14 +++++++------ net/wireless/reg.c | 2 +- net/wireless/trace.h | 11 +++++++---- 6 files changed, 70 insertions(+), 25 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index a741678f24a2..883fe1e7c5a1 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -4868,6 +4868,23 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy, struct cfg80211_chan_def *chandef, enum nl80211_iftype iftype); +/** + * cfg80211_reg_can_beacon_relax - check if beaconing is allowed with relaxation + * @wiphy: the wiphy + * @chandef: the channel definition + * @iftype: interface type + * + * Return: %true if there is no secondary channel or the secondary channel(s) + * can be used for beaconing (i.e. is not a radar channel etc.). This version + * also checks if IR-relaxation conditions apply, to allow beaconing under + * more permissive conditions. + * + * Requires the RTNL to be held. + */ +bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, + struct cfg80211_chan_def *chandef, + enum nl80211_iftype iftype); + /* * cfg80211_ch_switch_notify - update wdev channel and notify userspace * @dev: the device which switched channels diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c index ad31b2dab4f5..8db6e2994bbc 100644 --- a/net/mac80211/tdls.c +++ b/net/mac80211/tdls.c @@ -60,6 +60,7 @@ ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, struct ieee80211_channel *ch; struct cfg80211_chan_def chandef; int i, subband_start; + struct wiphy *wiphy = sdata->local->hw.wiphy; for (i = start; i <= end; i += spacing) { if (!ch_cnt) @@ -70,9 +71,8 @@ ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, /* we will be active on the channel */ cfg80211_chandef_create(&chandef, ch, NL80211_CHAN_NO_HT); - if (cfg80211_reg_can_beacon(sdata->local->hw.wiphy, - &chandef, - sdata->wdev.iftype)) { + if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, + sdata->wdev.iftype)) { ch_cnt++; /* * check if the next channel is also part of diff --git a/net/wireless/chan.c b/net/wireless/chan.c index 915b328b9ac5..59cabc9bce69 100644 --- a/net/wireless/chan.c +++ b/net/wireless/chan.c @@ -797,23 +797,18 @@ static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, return false; } -bool cfg80211_reg_can_beacon(struct wiphy *wiphy, - struct cfg80211_chan_def *chandef, - enum nl80211_iftype iftype) +static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, + struct cfg80211_chan_def *chandef, + enum nl80211_iftype iftype, + bool check_no_ir) { bool res; u32 prohibited_flags = IEEE80211_CHAN_DISABLED | IEEE80211_CHAN_RADAR; - trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype); + trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); - /* - * Under certain conditions suggested by some regulatory bodies a - * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag - * only if such relaxations are not enabled and the conditions are not - * met. - */ - if (!cfg80211_ir_permissive_chan(wiphy, iftype, chandef->chan)) + if (check_no_ir) prohibited_flags |= IEEE80211_CHAN_NO_IR; if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && @@ -827,8 +822,36 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy, trace_cfg80211_return_bool(res); return res; } + +bool cfg80211_reg_can_beacon(struct wiphy *wiphy, + struct cfg80211_chan_def *chandef, + enum nl80211_iftype iftype) +{ + return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); +} EXPORT_SYMBOL(cfg80211_reg_can_beacon); +bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, + struct cfg80211_chan_def *chandef, + enum nl80211_iftype iftype) +{ + bool check_no_ir; + + ASSERT_RTNL(); + + /* + * Under certain conditions suggested by some regulatory bodies a + * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag + * only if such relaxations are not enabled and the conditions are not + * met. + */ + check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, + chandef->chan); + + return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); +} +EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); + int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, struct cfg80211_chan_def *chandef) { diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index c264effd00a6..76b41578a838 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -2003,7 +2003,8 @@ static int __nl80211_set_channel(struct cfg80211_registered_device *rdev, switch (iftype) { case NL80211_IFTYPE_AP: case NL80211_IFTYPE_P2P_GO: - if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, iftype)) { + if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &chandef, + iftype)) { result = -EINVAL; break; } @@ -3403,8 +3404,8 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info) } else if (!nl80211_get_ap_channel(rdev, ¶ms)) return -EINVAL; - if (!cfg80211_reg_can_beacon(&rdev->wiphy, ¶ms.chandef, - wdev->iftype)) + if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, ¶ms.chandef, + wdev->iftype)) return -EINVAL; if (info->attrs[NL80211_ATTR_ACL_POLICY]) { @@ -6492,8 +6493,8 @@ skip_beacons: if (err) return err; - if (!cfg80211_reg_can_beacon(&rdev->wiphy, ¶ms.chandef, - wdev->iftype)) + if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, ¶ms.chandef, + wdev->iftype)) return -EINVAL; err = cfg80211_chandef_dfs_required(wdev->wiphy, @@ -10170,7 +10171,8 @@ static int nl80211_tdls_channel_switch(struct sk_buff *skb, return -EINVAL; /* we will be active on the TDLS link */ - if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, wdev->iftype)) + if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &chandef, + wdev->iftype)) return -EINVAL; /* don't allow switching to DFS channels */ diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 29134c81e73c..aa2d75482017 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -1589,7 +1589,7 @@ static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev) case NL80211_IFTYPE_AP: case NL80211_IFTYPE_P2P_GO: case NL80211_IFTYPE_ADHOC: - return cfg80211_reg_can_beacon(wiphy, &chandef, iftype); + return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype); case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_P2P_CLIENT: return cfg80211_chandef_usable(wiphy, &chandef, diff --git a/net/wireless/trace.h b/net/wireless/trace.h index af3617c9879e..a808279a432a 100644 --- a/net/wireless/trace.h +++ b/net/wireless/trace.h @@ -2358,20 +2358,23 @@ TRACE_EVENT(cfg80211_cqm_rssi_notify, TRACE_EVENT(cfg80211_reg_can_beacon, TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef, - enum nl80211_iftype iftype), - TP_ARGS(wiphy, chandef, iftype), + enum nl80211_iftype iftype, bool check_no_ir), + TP_ARGS(wiphy, chandef, iftype, check_no_ir), TP_STRUCT__entry( WIPHY_ENTRY CHAN_DEF_ENTRY __field(enum nl80211_iftype, iftype) + __field(bool, check_no_ir) ), TP_fast_assign( WIPHY_ASSIGN; CHAN_DEF_ASSIGN(chandef); __entry->iftype = iftype; + __entry->check_no_ir = check_no_ir; ), - TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", iftype=%d", - WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->iftype) + TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", iftype=%d check_no_ir=%s", + WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->iftype, + BOOL_TO_STR(__entry->check_no_ir)) ); TRACE_EVENT(cfg80211_chandef_dfs_required, -- 2.20.1